# CVE-2026-53957: Contentful MCP Server: export_space/import_space tools pass LLM-controlled `host`/`proxy` args to CMA client, redirecting server PAT to attacker-controlled endpoint

> CVE-2026-53957: Contentful MCP Server: export_space/import_space tools pass LLM-controlled `host`/`proxy` args to CMA client, redirecting server PAT to attacker-controlled endpoint. CVSS 7.7 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-53957
Last updated: 2026-09-30T17:51:56Z

- Published: 2026-09-15 14:34 UTC · Updated: 2026-09-30 17:51 UTC · Assigner: GitHub\_M
- CVSS: 7.7 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
- EPSS: 0.41%, 36th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-918

## Description

Contentful MCP Server is a Model Context Protocol server for the Contentful Management API. Prior to @contentful/mcp-server 1.7.19 and @contentful/mcp-tools 0.4.5, export\_space and import\_space in packages/mcp-tools/src/tools/jobs/space-to-space-migration/exportSpace.ts and packages/mcp-tools/src/tools/jobs/space-to-space-migration/importSpace.ts expose host, proxy, rawProxy, and insecure network options to LLM-controlled tool arguments and combine those options with the server's CONTENTFUL\_MANAGEMENT\_TOKEN. After space\_to\_space\_migration\_handler enables the migration tools, a direct MCP call or prompt injection through attacker-controlled Contentful content can redirect Contentful Management API requests and their Authorization header to an attacker-controlled host or proxy. The regular tools that use createToolClient are unaffected because those tools pin the host from server configuration. Exposure of the personal access token permits persistent out-of-band access to every Contentful space within the token's scope. This issue is fixed in @contentful/mcp-server 1.7.19 and @contentful/mcp-tools 0.4.5.

## Affected vendors and products

- @contentful: mcp-server
- @contentful: mcp-tools
- contentful: contentful-mcp-server

## Tracked companies

- [Contentful](https://rewindex.com/company/contentful.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-53957)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-53957)
- [https://github.com/contentful/contentful-mcp-server/commit/fa7477ee48515f4248bc91a025eab0ca83423fe0](https://github.com/contentful/contentful-mcp-server/commit/fa7477ee48515f4248bc91a025eab0ca83423fe0)
- [https://github.com/contentful/contentful-mcp-server/pull/376](https://github.com/contentful/contentful-mcp-server/pull/376)
- [https://github.com/contentful/contentful-mcp-server/releases/tag/mcp-server@1.7.19](https://github.com/contentful/contentful-mcp-server/releases/tag/mcp-server@1.7.19)
- [https://github.com/contentful/contentful-mcp-server/releases/tag/mcp-tools@0.4.5](https://github.com/contentful/contentful-mcp-server/releases/tag/mcp-tools@0.4.5)
- [https://github.com/contentful/contentful-mcp-server/security/advisories/GHSA-2xhg-73j7-rrgx](https://github.com/contentful/contentful-mcp-server/security/advisories/GHSA-2xhg-73j7-rrgx)

---

_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


---
Canonical: https://rewindex.com/cve/CVE-2026-53957 · Markdown: https://rewindex.com/cve/CVE-2026-53957.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-53957 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T04:05:26.626Z